That sucks! Ive just ran into fungus gnats for the first time since my first grow about 7 years ago. Im 99% sure its the hydro store i got my medium from.
I usually go to a nursery and they have all the promix in one section, organic "dirts" in other sections, coco in another section, etc....
Where as the hydro store has a basement type thing to keep it all cool and moist ish. The problem with that is roots basically comes crawlin with fungus gnats and im assuming they made their way to the promix i got because we super cleaned our room before we started teh DOGs and bug bombed it. Then brought in the infected ass shit.
If you ever need a part time/full time worker let me know! haha A job has been the only thing stoppin me from moving outta state to a more compassionate one.
Hope all the clones recover and prosper!!